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I don't see anything wrong with stopped. It simply means that she ceased her present activity.
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p.s.w.gJun 12 '13 at 1:36

"stopped" is perfectly common to use to indicate cessation of any activity. He stopped reading. He stopped scanning the room. She stopped calculating differential equations. The lawnmower suddenly stopped.

If there is a particular implication that you are aiming for, you might want to check the dictionary for all meanings of "stopped", then check the thesaurus for all synonyms, and the dictionary for all meanings of those synonyms.

The first word that came to mind when I read the sentence was "paused." As in, "she suddenly paused." That could refer to movement, but I have no trouble thinking that it refers to her scanning of the books.
However, 'stopped', as well, works fine in the context. 'Paused' just seems to be a slightly more descriptive choice.